Two Cases in Which Retroillumination Was Effective for Visual Acuity Testing

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  • 徹照像が視力検査に有用であった2症例

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[Purpose] To report two cases in which retroillumination photography performed during refraction examination provided useful information for visual acuity tests.<br>[Case 1] The patient was a 77-year-old female with Toric IOL in both eyes. When marking the axis for the Toric IOL, we used the values measured by a protractor on retroillumination images taken by Auto Ref/Keratometer ARK-1s (NIDEK) and the values obtained from retroillumination images by Refractive Power/Corneal Analyzer OPD-SCAN III (NIDEK). The differences between the values by the two instruments were all within 3 degrees. <br>[Case 2] The patient was a 64-year-old female whose objective and subjective refraction results showed discrepancies due to IOL dislocation. Using ARK-1s, refraction examination and corneal radius measurement were conducted and retroillumination images were captured. Eye aberration was also measured by OPD-SCAN III. Regardless of an immeasurable result for the objective refraction, the subjective refraction indicated a favorable result showing (0.7×IOL)(1.2×cyl-1.25 D 90°). A downward IOL deviation was confirmed on the retroillumination images by ARK-Is. Although the objective refraction did not yield valid results because of the IOL edge around the center of the pupil, we considered that good visual acuity was achieved since 31.4% of the pupil was still effectively covered by the IOL and appropriate IOL selection was made for the patient's visual characteristics. <br>[Conclusion] Retroillumination photography performed during objective refraction examination can provide useful information for visual acuity test.

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